| Revenue - Collaboration Agreement - The GSK Collaboration and License Agreement (Details) - GSK Collaboration And License Agreement | Dec. 31, 2023  USD ($) | Dec. 19, 2022  USD ($) | Dec. 19, 2022  GBP (£) | 
|---|---|---|---|
| Revenue | |||
| Aggregate transaction price of the contract modification | $ 6,500,000 | ||
| Amount of remaining deferred income under the collaboration that had not been recognized as revenue | $ 0 | ||
| Payment by GSK due to termination of collaboration | £ | £ 5,000,000 | 
| X | ||||||||||
| 
- Definition Amount of payment due to termination of collaboration. No definition available. 
 | 
| X | ||||||||||
| 
- Definition Amount aggregate transaction price of the contract modification. No definition available. 
 | 
| X | ||||||||||
| 
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
 | 
| X | ||||||||||
| 
- Definition Amount of transaction price allocated to performance obligation that has not been recognized as revenue. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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| X | ||||||||||
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- Details 
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